I there any truth to this statement?
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General Motors has their own standard for motor oils, recommended specifically for 2011 vehicles and later, but are compatible with earlier model years. Dexos standards are a combination of North American and European standards. Dexos 1 is made for gasoline vehicles and will be sold mainly in North America. Dexos 2 is for either diesel or gasoline vehicles, sold mainly in Europe. Dexos 2 is equivalent to MB229.51 for Mercedes, BMW standard LL-04, VW 502.00/505.00/505.01 standards, designed for the higher requirements of diesels so it is probably better oil but could have negative impact on fuel efficiency.
Federal law prohibits GM from requiring Dexos motor oils to maintain their warranty and your owners manual specifically states “dexos licensed or equivalent” products should be used. Many motor oils available have paid royalties to GM for licensing of their products and others have not. For the most part, Dexos is full synthetic motor oil and many other oils meet or exceed their standards."
Ha, use to be just conventional engine oils or or dinosaur oils as they were erroneously called. Ran several vehicles on Quaker State, a conventional oil well over the 200K mark, some over 250K, one over 330K without any engine problems. Road salt was the major problem for their demise.
Ha, then came along synthetic, use to say, why should I pay extra for synthetic when I could buy the real stuff much cheaper.
One thing I did learn very quickly, synthetics are far more superior of small engines, like your lawn mower or snowthrower, but these are air cooled engines. And synthetics can take a lot more heat than breaking down. 1986 Honda Civic already had 230K miles on on Quaker State and wasn't using any oil, but a water cooled engine, But a vehicle needs more than an engine to run also needs a body, wasn't much left of that.
Brand new 1988 Supra Turbo only got Quaker State, that's all they had back then, synthetics was more than twice the price as conventional with really no advantages. Sure they were advertising NASCAR, Indy 500, but the rest of use a dragging along at 55 mph.
When I got my Cruze, scared into using synthetics so no choice, but the changing intervals was much greater, and the price tag for dexos was only about five bucks more per change. Dealer wanted 40 bucks more for dexos, screw you, I will change it myself.
Ha, for the first time in 28 years, put synthetics in my Supra. Do I notice any difference? Not at 55 mph.